AutoTools Pass Tasker variable to JSON Read

I'm trying to set up a task that queries a weather api based on my current location. I have one task set up so far that just grabs my location and splits it into lat and long but when I try to get JSON read to accept:

api.openweathermap.org/data/2.5/forecast?lat=%LOC1&lon=%LOC2&units=metric&APPID=#############

It clearly sends %LOC1 and %\LOC2 just as is (the information is not found).
So I tried using an HTTP get in Tasker and then putting %HTTPD in the JSON read field but it just tells me that's not a valid URL.
Is what I'm trying possible? The documentation seems to indicate it is but I cant find any solid guide on how to get JSON read to accept a Tasker variable

 

I've never had a problem with it passing variables, just variables within variables. Can you paste the task description? Long tap the task name, select export then description to clipboard and paste in a reply.

 

Code (Text):

Weather (49)     Abort Existing Task, Stay Awake  
A1: GPS [ Set:On ]  
A2: Perform Task [ Name:Latlong Priority:%priority Parameter 1 (%par1): Parameter 2 (%par2): Return Value Variable: Stop:Off ]  
A3: HTTP Get [ Serve:pr: Port:http://api.openweathermap.org/data/2.5/forecast?lat=%LOC1&lon=%LOC2&units=metric&APPID=2673808b1dd8988e15312a1a3669da53 Path: Attributes: Cookies: User Agent: Timeout:10 Mime Type: Output File: Trust Any Certificate:Off ]  
A4: Flash [ Text:%HTTPD Long:Off ]

Not sure how much help this will be as I literally can't get the JSON read part of the task to save.
After the above I go + Action >> Plugin >> AutoTools >> Json Read >> Configuration >> Json >> " %HTTPD " (minus quotes)
If you hit Authenticate it flashes the error "The regex you have entered is not a valid URL". If you try to save it says the settings aren't valid and if I exit they'll be lost.